docs: def result(self):
          """return::
  
               (xbest, f(xbest), evaluations_xbest, evaluations, iterations,
                   pheno(xmean), effective_stds)
  
          """
          # TODO: how about xcurrent?
          return self.best.get() + (
              self.countevals, self.countiter, self.gp.pheno(self.mean),
              self.gp.scales * self.sigma * self.sigma_vec * self.dC**0.5)